Which of the following primarily reflects the opening of voltage-gated Na* channels? A. The resting membrane potential B. The depolarization phase of the action potential C. The threshold potential D. The repolarization phase of the action potential E. All of the above

As the axonal membrane depolarizes during the rising phase of an action potential, the amplitude of Na+ conductance changes from large to small the amplitude of Na+ conductance changes from small to large there is no Na+ conductance during this phase of the action potential the amplitude of Na+ conductance remains large and constant throughout

factors responsible for a negative resting membrane potential include: check all that apply:   a. Na K pump  b. different carrier proteins  c. uneven distribution of ions  d. difference in permeability of ions  e. high potassium concentration in ECF

Dr. Brainy creates a nerve cell that is only permeable to Caesium ions (Cs+1) at rest. She measures that the concentration of Caesium is 400mM outside the cell and only 50 mM inside the cell. She calculates the Equilibrium potential for Cs+1 (Ecs) to be +35 mV. If the cell is only permeable to Cs, the resting membrane potential will be: +58 mV 0 mV +35 mV -58 mV

On the graph above, when do the sodium ion channels close? Select one: a. between 0.2 ms and 0.5 ms, which is when depolarization occurs b. at 0.2 ms, which is when depolarization occurs c. at 0.5 ms, which is when repolarization begins d. between 0.5 ms and 0.8 ms, which is when repolarization occurs

What enables action potential to jump from one node of Ranvier to the next? A. Increased LC B. Increased membrane resistance OC. Decreased LC OD. A and B OE. B and C mmmmm

Based on the graph, the threshold voltage appears to be approximately. (Base your answer to this question on the graph below depicting an action potential.) +60 mV. +30 mV. 0 mV. −30 mV. −60 mV.

What determines the effect of neurotransmitter release on the post-synaptic neurons?  a. the size of the action potential. b. the post-synaptic receptors c. the neurotransmitter contained in the synaptic vesicles. d. the concentration of calcium ions reached in presynaptic terminals. e. the size of the synaptic vesicles.

Which of the following allows the cell to recover from hyperpolarization during an action potential?   A. Stimulus gated sodium channels B. voltage gated sodium channels C. voltage gated potassium channels D. sodium/potassium pump

A theoretical drug blocks Na* leak channels - what effect would this have on a neuron's resting membrane potential and why? Would this drug affect the neuron's ability to generate an action potential and why/why not?